Hybrid availability plunges as demand rises

Toyota Prius hybrid cars are displayed at City Toyota in April in Daly City, Calif. Sales of the hybrids increased by 61 percent in April, then fell by more than 37 percent in May – but only because Toyota ran out of cars to sell.

Blame the holdup on batteries. Time magazine reports that the specialized nickel-metal-hydride batteries used in the Prius and other hybrids are increasingly hard to come by. Toyota is planning to build two battery plants in Japan, but they won't come online until 2010. GM, meanwhile, is "deep into negotiations" to buy a Detroit-based hybrid batterymaker. "The irony," notes Time, "is that the batteries are virtually identical to those GM declined to put in first generation vehicles back in the 1990s, as related in a recent documentary Who Killed The Electric Car."

The demand for batteries will only go up. GM, which recently announced that it will be cutting back on its SUVs (and their workers), plans to roll out eight hybrid models for 2009. And Honda, whose Civic posted record sales last month, is planning to increase production of its hybrid vehicles.

In the meantime, Toyota is developing a lithium-ion battery for its hybrids, according to Reuters. Lithium-ion batteries, like the one you probably have in your laptop or mobile phone, are smaller and can store more energy than the current nickel-metal-hydride batteries. Lithium-ion batteries, reports the Associated Press, will be used for the next-generation Prius, with a hybrid engine that can be charged from a home electrical outlet. GM is planning on using these batteries for its all-electric Chevy Volt, which will also be available in 2010.

In the short-term, though, those wanting to improve their fuel economy will have to get on a waiting list, settle for a nonhybrid car, or opt for the greenest choice of all by keeping the cars they already have and driving them less.